datetime - how to create a date object in python representing a set number of days -

i define variable datetime object representing number of days entered user. example.

numdays = #input user deltadatetime = #this i'm trying figure out how str(datetime.datetime.now() + deltadatetime) 

this code print out datetime representing 3 days today if user entered 3 input. idea how this? i'm lost effective approach problem.

edit: because of how system set up, variable storing "deltadatetime" value must datetime value. said in comments, 3 days becomes year 0, january 3rd.

it's straightforward using timedelta standard datetime library:

import datetime numdays = 5   # heh, removed 'var' in front of (braincramp) print datetime.datetime.now() + datetime.timedelta(days=numdays)